What is the difference between SPADNS and SPADNS 2?

Document ID

Document ID TE3418

Version

Version 3.0

Status

Status Published

Published Date

Published Date 07/24/2018
Question
What is the difference between SPADNS and SPADNS 2?
Summary
SPADNS and SPADNS 2 reagent.
Answer
The SPADNS 2 reagent was developed by Hach to replace the traditional SPADNS reagent. Traditional SPADNS reagent contained arsenic to prevent chlorine interference. The new SPADNS 2 reagent contains a proprietary non-toxic compound that achieves the same result. The new reagent follows the same procedures, calibration curves and contains the same accuracy as traditional reagents. The new reagent is also EPA compliant and equivalent to EPA reference method SM4500-F D. A letter is attached to this article that gives comparison data between the two.
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